Radek Mezulanik

You can lock whole website by setting it under maintenance.
Features:
<ul>
<li>
Select roles who applies maintenance mode
</li>
<li>
Set a redirect to login page
</li>
<li>
Edit a maintenance message in wysiwyg editor including media
</li>
</ul>
<h3>Sponsorship</h3>
<a href="https://www.productboard.com" rel="nofollow ugc">Productboard</a>

Zedna Maintenance Mode

Set you website under maintenance to lock content while development.

Bloafer

This is a beta, please use at own risk, White label WordPress with a plugin instead of hacking the WordPress core.
This plugin is perfect for those who use WordPress as a development environment but would like to hide the fact WordPress has been used.

WordPress White Label

White label WordPress with a plugin instead of hacking the WordPress core.

Zedna Maintenance Mode vs WordPress White Label